CN114320247B - Comprehensive discrimination method and device for gas-drive mixed phase index - Google Patents
Comprehensive discrimination method and device for gas-drive mixed phase index Download PDFInfo
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Abstract
The invention provides a comprehensive discrimination method and device for gas-drive mixed phase indexes, wherein the method comprises the following steps: performing a physical simulation gas-drive experiment on the rock core; collecting pressure data, temperature data, fluid density data and fluid composition data in the physical simulation gas drive experiment; and determining the gas-drive miscible index of the oil reservoir corresponding to the core according to the acquired pressure data, temperature data, fluid density data and fluid composition data. The invention can determine the multi-parameter gas-drive mixed phase evaluation index to carry out comprehensive discrimination, thereby improving the field applicability and further improving the gas-drive efficiency.
Description
Technical Field
The invention relates to the technical field of petroleum development experiments, in particular to a comprehensive distinguishing method and device for gas-drive miscible indexes.
Background
The development of gas drive enhanced oil recovery technology, which is subjected to field tests in a plurality of oil fields in succession, has been applied in large scale especially in the last decade, and has become an important component of China's petroleum enhanced oil recovery technology. As the technology continues to be applied deeper, oilfield sites are increasingly exposed to more serious production conflicts, such as: the mixed phase area is not clearly identified, the gas channeling is serious, the method for expanding the swept volume is single (the gas drive wave and volume are expanded by the common water-gas alternate injection mode), the gas drive state rule is difficult to recognize, and the like, so that the injection and production regulation and control are difficult to effectively play a role, and the gas drive development effect is poor. The core of the problems is the establishment of the evaluation index of the gas-driven mixed phase, which is helpful for the establishment of the mixed phase area, the mixed phase degree, the gas channeling scale and the injection and production regulation and control countermeasures.
The traditional gas-driven miscible phase evaluation index is derived from petroleum industry standard "minimum miscible phase pressure experiment determination method-tubule method", and mainly comprises 2 indexes: the oil displacement efficiency is not lower than 90% when the pore volume is 1.2 times of the pore volume is injected; the miscible phenomenon can be observed in the high-pressure window, namely, no obvious interface exists between oil and gas. The method is extremely limited and can only be used for mixed phase gas flooding theoretical research.
Therefore, the existing gas-drive mixed phase evaluation index is single, the field applicability is reduced, and the gas-drive efficiency is further affected.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the following technical scheme:
in a first aspect, the present invention provides a method for comprehensively discriminating a gas-driven mixed phase index, including:
performing a physical simulation gas-drive experiment on the rock core;
collecting pressure data, temperature data, fluid density data and fluid composition data in the physical simulation gas drive experiment;
and determining the gas-drive miscible index of the oil reservoir corresponding to the core according to the acquired pressure data, temperature data, fluid density data and fluid composition data.
Wherein, carry out physical simulation gas drive experiment to the rock core includes:
adopting a preset rock core displacement experimental device to perform non-miscible displacement, near-miscible displacement and miscible displacement of a target gas medium on the rock core;
Wherein, rock core displacement experimental apparatus includes: the sand filling device, the heating constant temperature device, the data acquisition device, the power device and the auxiliary device;
The sand filling device is a tubular container with preset length, and the tubular container is filled with porous media; the two ends of the tubular container are respectively connected with the power device; one end of the porous medium outlet of the tubular container is connected with the auxiliary device;
The data acquisition device is used for acquiring images in the core displacement experiment process; the power device is used for filling the tubular container with a porous medium and a displacement medium; the auxiliary device is used for collecting the porous medium and the displacement medium in the tubular container; the heating constant temperature device is used for heating the tubular container.
The target gas is carbon dioxide. The pressure of the non-miscible phase flooding is 15MPa; the pressure of the near miscible phase flooding is 20MPa; the pressure of the mixed phase driving is 24MPa.
The gas-drive mixed phase index comprises: at least one of pressure, displacement efficiency, and produced hydrocarbon composition.
In a second aspect, the present invention provides a gas-driven mixed phase index comprehensive discrimination device, including:
The experiment unit is used for performing a physical simulation gas-drive experiment on the rock core;
the acquisition unit is used for acquiring pressure data, temperature data, fluid density data and fluid composition data in the physical simulation gas drive experiment;
and the processing unit is used for determining the gas-drive miscible index of the oil reservoir corresponding to the core according to the acquired pressure data, temperature data, fluid density data and fluid composition data.
Wherein, the experimental unit includes:
And the experimental subunit is used for carrying out non-miscible phase driving, near-miscible phase driving and miscible phase driving on the core by adopting a preset core displacement experimental device.
The target gas is carbon dioxide; the pressure of the non-miscible phase flooding is 15MPa; the pressure of the near miscible phase flooding is 20MPa; the pressure of the mixed phase driving is 24MPa.
In a third aspect, the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor, where the processor implements the steps of the gas-driven mixed phase index comprehensive discrimination method when executing the program.
In a fourth aspect, the present invention provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the gas-driven mixed-phase index comprehensive discrimination method.
According to the technical scheme, the invention provides a comprehensive discrimination method and device for gas-drive miscible indexes, and physical simulation gas-drive experiments are carried out on a rock core; collecting pressure data, temperature data, fluid density data and fluid composition data in the physical simulation gas drive experiment; and determining the gas-drive miscible index of the oil reservoir corresponding to the core according to the collected pressure data, temperature data, fluid density data and fluid composition data, and determining the multi-parameter gas-drive miscible evaluation index to comprehensively judge, so that the field applicability is improved, and the gas-drive efficiency is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a comprehensive discrimination method for gas-driven mixed phase indexes in an embodiment of the invention.
Fig. 2 is a comparison curve of final oil displacement efficiency and CO 2 breakthrough time of three groups of experiments in the gas-driven mixed phase index comprehensive discrimination method provided by the embodiment of the invention.
Fig. 3 is a graph showing the relationship between the molar contents of the produced oil C 6-16 and CO 2 in the gas-driven mixed phase index comprehensive discrimination method according to the embodiment of the present invention.
Fig. 4 is a graph showing the relationship between the molar contents of the produced oil C 36+ and CO 2 in the gas-driven mixed phase index comprehensive discrimination method according to the embodiment of the present invention.
Fig. 5 is a graph showing a reduction factor of produced oil C 36+ when the content of produced gas CO 2 is 90% in the gas-driven miscible index comprehensive discrimination method according to the embodiment of the present invention.
Fig. 6 is a graph showing a reduction factor of produced oil C 6-16 when the content of produced gas CO 2 is 90% in the gas-driven miscible index comprehensive discrimination method according to the embodiment of the present invention.
Fig. 7 is a schematic structural diagram of a gas-driven mixed-phase index comprehensive discriminating apparatus according to an embodiment of the invention.
Fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides an embodiment of a comprehensive gas-drive mixed-phase index distinguishing method, referring to fig. 1, which specifically comprises the following steps:
S101: performing a physical simulation gas-drive experiment on the rock core;
In the step, adopting a preset rock core displacement experimental device to perform non-miscible phase displacement, near-miscible phase displacement and miscible phase displacement of a target gas medium on the rock core;
Wherein, rock core displacement experimental apparatus includes: the sand filling device, the heating constant temperature device, the data acquisition device, the power device and the auxiliary device;
The sand filling device is a tubular container with preset length, and the tubular container is filled with porous media; the two ends of the tubular container are respectively connected with the power device; one end of the porous medium outlet of the tubular container is connected with the auxiliary device;
The data acquisition device is used for acquiring images in the core displacement experiment process; the power device is used for filling the tubular container with a porous medium and a displacement medium; the auxiliary device is used for collecting the porous medium and the displacement medium in the tubular container; the heating constant temperature device is used for heating the tubular container. The sand filling device is a 30-meter long tubular container, and the sand filling device bends 180 degrees every 1 meter. A transparent observation window is arranged on the tubular container at intervals of 1 meter. The data acquisition device includes: a stand, a high-speed camera, a stereoscopic microscope, and an industrial camera;
It can be understood that in the experimental process, the seepage state in the pore is observed through the observation window, the photo, the sectional pressure, the temperature, the fluid viscosity/density and the fluid composition are acquired at certain intervals, the change of each key parameter of the non-miscible phase, the near-miscible phase and the miscible phase flooding is compared, and the miscible phase evaluation index of the corresponding oil reservoir and the injected gas is established.
S102: collecting pressure data, temperature data, fluid density data and fluid composition data in the physical simulation gas drive experiment;
S103: and determining the gas-drive miscible index of the oil reservoir corresponding to the core according to the acquired pressure data, temperature data, fluid density data and fluid composition data.
In this step, the gas-driven miscible index includes: at least one of pressure, displacement efficiency, and produced hydrocarbon composition.
In the above embodiment, the target gas is carbon dioxide. The pressure of the non-miscible phase flooding is 15MPa; the pressure of the near miscible phase driving is 20MPa; the pressure of the mixed phase driving is 24MPa.
It should be noted that, the present embodiment can overcome the limitation caused by a single gas-driven miscible index. And the gas-drive mixed phase evaluation indexes of a plurality of parameters are applied to synthesis, so that the field applicability is improved.
From the above description, it can be known that the method for comprehensively distinguishing the gas-drive miscible index provided by the embodiment of the invention performs a physical simulation gas-drive experiment on the core; collecting pressure data, temperature data, fluid density data and fluid composition data in the physical simulation gas drive experiment; according to the collected pressure data, temperature data, fluid density data and fluid composition data, determining the gas-drive miscible index of the oil reservoir corresponding to the core, and changing a single discrimination mode of the miscible evaluation index which is only intuitively observed by using oil displacement efficiency and miscible phenomenon in the past; and establishing a multi-parameter gas-drive mixed phase evaluation index comprehensive discrimination mode, determining the multi-parameter gas-drive mixed phase evaluation index to carry out comprehensive discrimination, improving the field applicability, and further improving the gas-drive efficiency.
In order to explain the gas-driven mixed-phase index comprehensive distinguishing method of the embodiment, the embodiment provides a specific application example of the gas-driven mixed-phase index comprehensive distinguishing method, which specifically comprises the following steps:
3 groups of long one-dimensional multi-measuring-point visual model experiments of CO 2 non-miscible phase flooding (15 MPa), near miscible phase flooding (20 MPa) and miscible phase flooding (24 MPa) are respectively carried out, pressure, photos, fluid samples and the like are collected in sections at certain time intervals according to experimental requirements, comprehensive evaluation analysis is carried out on experimental data, and the following CO 2 miscible phase comprehensive evaluation index is established.
(1) Pressure: the lowest miscible pressure of crude oil and CO 2 in the test area is determined to be 22.3MPa by a thin pipe experiment, so that the crude oil is determined to be a miscible flooding;
(2) Oil displacement efficiency: the final oil displacement efficiency and experimental pressure corresponding relation of 3 groups of experiments are drawn in fig. 2, and it can be seen that the oil displacement efficiency corresponding to the lowest miscible phase pressure is 77.23%, and for the experimental study, it can be determined that the total oil displacement efficiency is greater than 77.23% as a miscible phase drive;
(3) CO 2 breakthrough time: drawing the corresponding relation between the breakthrough time of 3 groups of experiment CO 2 and the experiment pressure in fig. 2, it can be seen that, for the experimental study, the breakthrough time of CO 2 is after the injection amount of 0.56HCPV, and the mixed phase flooding can be judged;
(4) Mixing phase characteristics: a miscible phenomenon can be observed in the high pressure observation window, i.e. no obvious interface exists between the injected CO 2 and crude oil;
(5) And (3) producing oil gas components: 3-6, when the content of CO 2 is 90%, the content of heavy components such as produced oil C 36+ is reduced to less than 1/10 of the crude oil of the stratum, and the content of C 6-16 is increased to 1.5-2 times of the crude oil of the stratum, so that the mixed phase flooding can be judged.
The embodiment of the invention provides a specific implementation manner of a gas-driven mixed phase index comprehensive distinguishing device capable of realizing all contents in the gas-driven mixed phase index comprehensive distinguishing method, and referring to fig. 7, the gas-driven mixed phase index comprehensive distinguishing device specifically comprises the following contents:
the experiment unit 10 is used for performing a physical simulation gas-drive experiment on the rock core;
The acquisition unit 20 is used for acquiring pressure data, temperature data, fluid density data and fluid composition data in the physical simulation gas drive experiment;
And the processing unit 30 is used for determining the gas-drive miscible index of the oil reservoir corresponding to the core according to the acquired pressure data, temperature data, fluid density data and fluid composition data.
Wherein, the experimental unit includes:
And the experimental subunit is used for carrying out non-miscible phase driving, near-miscible phase driving and miscible phase driving on the core by adopting a preset core displacement experimental device.
The target gas is carbon dioxide; the pressure of the non-miscible phase flooding is 15MPa; the pressure of the near miscible phase flooding is 20MPa; the pressure of the mixed phase driving is 24MPa.
The embodiment of the gas-driven mixed phase index comprehensive judging device provided by the invention can be particularly used for executing the processing flow of the embodiment of the gas-driven mixed phase index comprehensive judging method in the embodiment, and the functions of the embodiment of the gas-driven mixed phase index comprehensive judging device are not repeated herein, and can be referred to in the detailed description of the embodiment of the method.
From the above description, it can be known that the gas-drive miscible index comprehensive discriminating apparatus provided by the embodiment of the invention performs a physical simulation gas-drive experiment on the core; collecting pressure data, temperature data, fluid density data and fluid composition data in the physical simulation gas drive experiment; according to the collected pressure data, temperature data, fluid density data and fluid composition data, determining the gas-drive miscible index of the oil reservoir corresponding to the core, and changing a single discrimination mode of the miscible evaluation index which is only intuitively observed by using oil displacement efficiency and miscible phenomenon in the past; and establishing a multi-parameter gas-drive mixed phase evaluation index comprehensive discrimination mode, determining the multi-parameter gas-drive mixed phase evaluation index to carry out comprehensive discrimination, improving the field applicability, and further improving the gas-drive efficiency.
The application provides an embodiment of electronic equipment for realizing all or part of contents in a gas-driven mixed phase index comprehensive judging method, which specifically comprises the following contents:
a processor (processor), a memory (memory), a communication interface (Communications Interface), and a bus; the processor, the memory and the communication interface complete communication with each other through the bus; the communication interface is used for realizing information transmission between related devices; the electronic device may be a desktop computer, a tablet computer, a mobile terminal, etc., and the embodiment is not limited thereto. In this embodiment, the electronic device may be implemented with reference to an embodiment for implementing the method for comprehensively determining a gas-driven mixed phase index and an embodiment for implementing the device for comprehensively determining a gas-driven mixed phase index, and the contents thereof are incorporated herein, and the repetition is omitted.
Fig. 8 is a schematic block diagram of a system configuration of an electronic device 9600 according to an embodiment of the present application. As shown in fig. 8, the electronic device 9600 may include a central processor 9100 and a memory 9140; the memory 9140 is coupled to the central processor 9100. Notably, this fig. 8 is exemplary; other types of structures may also be used in addition to or in place of the structures to implement telecommunications functions or other functions.
In one embodiment, the gas-driven mixed-phase index comprehensive discrimination function may be integrated into the cpu 9100. The central processor 9100 may be configured to perform the following control:
performing a physical simulation gas-drive experiment on the rock core;
collecting pressure data, temperature data, fluid density data and fluid composition data in the physical simulation gas drive experiment;
and determining the gas-drive miscible index of the oil reservoir corresponding to the core according to the acquired pressure data, temperature data, fluid density data and fluid composition data.
From the above description, it can be seen that the electronic device provided by the embodiment of the present application performs a physical simulation gas-drive experiment on the core; collecting pressure data, temperature data, fluid density data and fluid composition data in the physical simulation gas drive experiment; according to the collected pressure data, temperature data, fluid density data and fluid composition data, determining the gas-drive miscible index of the oil reservoir corresponding to the core, and changing a single discrimination mode of the miscible evaluation index which is only intuitively observed by using oil displacement efficiency and miscible phenomenon in the past; and establishing a multi-parameter gas-drive mixed phase evaluation index comprehensive discrimination mode, determining the multi-parameter gas-drive mixed phase evaluation index to carry out comprehensive discrimination, improving the field applicability, and further improving the gas-drive efficiency.
In another embodiment, the gas-driven mixed-phase index comprehensive discrimination device may be configured separately from the central processor 9100, for example, the gas-driven mixed-phase index comprehensive discrimination device may be configured as a chip connected to the central processor 9100, and the gas-driven mixed-phase index comprehensive discrimination function is implemented by the control of the central processor.
As shown in fig. 8, the electronic device 9600 may further include: a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It is noted that the electronic device 9600 need not include all of the components shown in fig. 8; in addition, the electronic device 9600 may further include components not shown in fig. 8, and reference may be made to the related art.
As shown in fig. 8, the central processor 9100, sometimes referred to as a controller or operational control, may include a microprocessor or other processor device and/or logic device, which central processor 9100 receives inputs and controls the operation of the various components of the electronic device 9600.
The memory 9140 may be, for example, one or more of a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, or other suitable device. The information about failure may be stored, and a program for executing the information may be stored. And the central processor 9100 can execute the program stored in the memory 9140 to realize information storage or processing, and the like.
The input unit 9120 provides input to the central processor 9100. The input unit 9120 is, for example, a key or a touch input device. The power supply 9170 is used to provide power to the electronic device 9600. The display 9160 is used for displaying display objects such as images and characters. The display may be, for example, but not limited to, an LCD display.
The memory 9140 may be a solid state memory such as Read Only Memory (ROM), random Access Memory (RAM), SIM card, etc. But also a memory which holds information even when powered down, can be selectively erased and provided with further data, an example of which is sometimes referred to as EPROM or the like. The memory 9140 may also be some other type of device. The memory 9140 includes a buffer memory 9141 (sometimes referred to as a buffer). The memory 9140 may include an application/function storage portion 9142, the application/function storage portion 9142 storing application programs and function programs or a flow for executing operations of the electronic device 9600 by the central processor 9100.
The memory 9140 may also include a data store 9143, the data store 9143 for storing data, such as contacts, digital data, pictures, sounds, and/or any other data used by an electronic device. The driver storage portion 9144 of the memory 9140 may include various drivers of the electronic device for communication functions and/or for performing other functions of the electronic device (e.g., messaging applications, address book applications, etc.).
The communication module 9110 is a transmitter/receiver 9110 that transmits and receives signals via an antenna 9111. A communication module (transmitter/receiver) 9110 is coupled to the central processor 9100 to provide input signals and receive output signals, as in the case of conventional mobile communication terminals.
Based on different communication technologies, a plurality of communication modules 9110, such as a cellular network module, a bluetooth module, and/or a wireless local area network module, etc., may be provided in the same electronic device. The communication module (transmitter/receiver) 9110 is also coupled to a speaker 9131 and a microphone 9132 via an audio processor 9130 to provide audio output via the speaker 9131 and to receive audio input from the microphone 9132 to implement usual telecommunications functions. The audio processor 9130 can include any suitable buffers, decoders, amplifiers and so forth. In addition, the audio processor 9130 is also coupled to the central processor 9100 so that sound can be recorded locally through the microphone 9132 and sound stored locally can be played through the speaker 9131.
An embodiment of the present invention further provides a computer-readable storage medium capable of implementing all the steps of the gas-driven mixed-phase index comprehensive determination method in the above embodiment, where the computer-readable storage medium stores a computer program that, when executed by a processor, implements all the steps of the gas-driven mixed-phase index comprehensive determination method in the above embodiment, for example, the processor implements the following steps when executing the computer program:
performing a physical simulation gas-drive experiment on the rock core;
collecting pressure data, temperature data, fluid density data and fluid composition data in the physical simulation gas drive experiment;
and determining the gas-drive miscible index of the oil reservoir corresponding to the core according to the acquired pressure data, temperature data, fluid density data and fluid composition data.
As can be seen from the above description, the computer readable storage medium provided by the embodiments of the present invention performs a physical simulation gas-drive experiment on a core; collecting pressure data, temperature data, fluid density data and fluid composition data in the physical simulation gas drive experiment; according to the collected pressure data, temperature data, fluid density data and fluid composition data, determining the gas-drive miscible index of the oil reservoir corresponding to the core, and changing a single discrimination mode of the miscible evaluation index which is only intuitively observed by using oil displacement efficiency and miscible phenomenon in the past; and establishing a multi-parameter gas-drive mixed phase evaluation index comprehensive discrimination mode, determining the multi-parameter gas-drive mixed phase evaluation index to carry out comprehensive discrimination, improving the field applicability, and further improving the gas-drive efficiency.
Although the invention provides method operational steps as described in the examples or flowcharts, more or fewer operational steps may be included based on conventional or non-inventive labor. The order of steps recited in the embodiments is merely one way of performing the order of steps and does not represent a unique order of execution. When implemented by an actual device or client product, the instructions may be executed sequentially or in parallel (e.g., in a parallel processor or multi-threaded processing environment) as shown in the embodiments or figures.
It will be appreciated by those skilled in the art that embodiments of the present description may be provided as a method, apparatus (system) or computer program product. Accordingly, the present specification embodiments may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments. In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The present invention is not limited to any single aspect, nor to any single embodiment, nor to any combination and/or permutation of these aspects and/or embodiments. Moreover, each aspect and/or embodiment of the invention may be used alone or in combination with one or more other aspects and/or embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.
Claims (9)
1. The comprehensive distinguishing method for the gas-drive mixed phase index is characterized by comprising the following steps of:
performing a physical simulation gas-drive experiment on the rock core;
collecting pressure data, temperature data, fluid density data and fluid composition data in the physical simulation gas drive experiment;
Determining a gas-drive miscible index of the oil reservoir corresponding to the core according to the collected pressure data, temperature data, fluid density data and fluid composition data;
the determining the gas-drive miscible index of the oil reservoir corresponding to the core according to the collected pressure data, temperature data, fluid density data and fluid composition data comprises the following steps:
In the experimental process, observing the seepage state in the pore through an observation window, and collecting photos, sectional pressure, temperature, fluid density and fluid composition at intervals, and comparing the changes of key parameters of non-miscible phase, near-miscible phase and miscible phase flooding so as to establish miscible phase evaluation indexes of corresponding oil reservoirs and injection gases; the miscible evaluation indexes are pressure, oil displacement efficiency, injection gas breakthrough time and produced oil gas components.
2. The method for comprehensively distinguishing the gas-drive mixed phase index according to claim 1, wherein the performing the physical simulation gas-drive experiment on the core comprises:
adopting a preset rock core displacement experimental device to perform non-miscible displacement, near-miscible displacement and miscible displacement of a target gas medium on the rock core;
Wherein, rock core displacement experimental apparatus includes: the sand filling device, the heating constant temperature device, the data acquisition device, the power device and the auxiliary device;
The sand filling device is a tubular container with preset length, and the tubular container is filled with porous media; the two ends of the tubular container are respectively connected with the power device; one end of the porous medium outlet of the tubular container is connected with the auxiliary device;
The data acquisition device is used for acquiring images in the core displacement experiment process; the power device is used for filling the tubular container with a porous medium and a displacement medium; the auxiliary device is used for collecting the porous medium and the displacement medium in the tubular container; the heating constant temperature device is used for heating the tubular container.
3. The method for comprehensively distinguishing gas-driven mixed phase indexes according to claim 2, wherein the target gas medium is carbon dioxide.
4. The comprehensive discrimination method for gas-drive mixed phase indexes according to claim 2, wherein the pressure of the non-mixed phase drive is 15MPa; the pressure of the near miscible phase flooding is 20MPa; the pressure of the mixed phase driving is 24MPa.
5. The utility model provides a gas drives mixed phase index comprehensive discrimination device which characterized in that includes:
The experiment unit is used for performing a physical simulation gas-drive experiment on the rock core;
the acquisition unit is used for acquiring pressure data, temperature data, fluid density data and fluid composition data in the physical simulation gas drive experiment;
the processing unit is used for determining the gas-drive miscible index of the oil reservoir corresponding to the core according to the acquired pressure data, temperature data, fluid density data and fluid composition data;
The processing unit is specifically used for observing the seepage state in the pore through the observation window in the experimental process, collecting photos, sectional pressure, temperature, fluid density and fluid composition at certain intervals, and comparing the changes of key parameters of non-miscible phase, near-miscible phase and miscible phase flooding so as to establish miscible phase evaluation indexes of corresponding oil reservoirs and injected gas; the miscible evaluation indexes are pressure, oil displacement efficiency, injection gas breakthrough time and produced oil gas components.
6. The gas-driven mixed phase index comprehensive discrimination apparatus according to claim 5, wherein said experimental unit includes:
And the experimental subunit is used for carrying out non-miscible phase driving, near-miscible phase driving and miscible phase driving on the core by adopting a preset core displacement experimental device.
7. The gas-driven mixed-phase index comprehensive judging device according to claim 6, wherein the target gas medium is carbon dioxide; the pressure of the non-miscible phase flooding is 15MPa; the pressure of the near miscible phase flooding is 20MPa; the pressure of the mixed phase driving is 24MPa.
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the gas-driven mixed-phase index comprehensive discrimination method according to any one of claims 1 to 4 when executing the program.
9. A computer-readable storage medium having stored thereon a computer program, characterized in that the computer program, when executed by a processor, realizes the steps of the gas-driven mixed-phase index comprehensive discrimination method according to any one of claims 1 to 4.
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| CN103900755A (en) * | 2014-03-14 | 2014-07-02 | 大连理工大学 | Device and method for measuring minimum miscibility pressure of oil and gas through CT |
| CN106437639A (en) * | 2016-10-19 | 2017-02-22 | 中国石油化工股份有限公司 | Carbon dioxide mixed-phase flushing efficiency and remaining oil distribution evaluation method and isolated plant |
| CN106840790A (en) * | 2016-12-23 | 2017-06-13 | 东北石油大学 | CO is tested based on tubule consolidated model long2The method and system of crude oil MMP |
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| US20200063532A1 (en) * | 2018-08-21 | 2020-02-27 | Dassault Systemes Simulia Corp. | Determination of Oil Removed by Gas via Miscible Displacement in Reservoir Rock |
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| CN103900755A (en) * | 2014-03-14 | 2014-07-02 | 大连理工大学 | Device and method for measuring minimum miscibility pressure of oil and gas through CT |
| CN106437639A (en) * | 2016-10-19 | 2017-02-22 | 中国石油化工股份有限公司 | Carbon dioxide mixed-phase flushing efficiency and remaining oil distribution evaluation method and isolated plant |
| CN106840790A (en) * | 2016-12-23 | 2017-06-13 | 东北石油大学 | CO is tested based on tubule consolidated model long2The method and system of crude oil MMP |
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